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INSTRUCTION 

DX/UTC MANUAL 

 
 
 
 
 
 
 
 

 
 
 

Industrial

   

Sewing

   

Machines 

 

DX9902-3U 
DX9900-4U 

 
 
 
 
 
 
 
 
 
 
 
 
 
 

First published : November 1997 

Second edition

 

 : January

 

  1999 

No. 980101 

 

 

 

Summary of Contents for DX Series

Page 1: ...INSTRUCTION DX UTC MANUAL Industrial Sewing Machines DX9902 3U DX9900 4U First published November 1997 Second edition January 1999 No 980101 ...

Page 2: ...cial s DX UTC Series Read and study this instruction manual carefully before beginning any of the procedures and save it for later use This instruction manual describes adjustments and maintenance procedures for the thread trimmer Refer to the DX Series instruction manual for other information ...

Page 3: ...s 2 4 5 Relationship between the lower knives and the needles 3 4 6 Relationship between the upper and lower knives 3 4 7 Overlap of the upper and lower knives 3 4 8 Adjusting the leaf springs 4 4 9 Relationship between lower knives needle threads and looper threads 4 5 ADJUSTING THE THREAD RELEASER 5 1 Thread releaser lever 5 5 2 Thread releaser plate 5 5 3 Thread releaser hook 5 6 SAFETY DETECTO...

Page 4: ...laced at position A for the next sewing operation after the threads are cut 2 INSTALLING THE POSITION DETECTOR Install position detector A and tighten screw B temporarily Fit positioner bar C onto the guide groove of the position detector Then tighten screw D Turn on the motor Press the pedal with heel after two to three stitches are formed by pressing the pedal with toe Then the needle stops Loos...

Page 5: ...8 5 8 5 8 5 46 1mm 6 4 6 4 6 4 43 9mm 4 4 4 4 2 Upper knife at the extreme left end of its stroke 2 Upper knife at the extreme left end of its stroke 2 Upper knife at the extreme left end of its stroke 2 Upper knife at the extreme left end of its stroke Lower knife carrier A and upper knife carrier B move to the left simultaneously Upper knife carrier B stops when reaching positioning stopper C 4 ...

Page 6: ...ing the procedure stated above Distance Gauge a b 4 8 10 10 10 4 0mm 5 0 13 13 13 3 8mm 9 5 9 5 9 5 6mm 8 5 8 5 8 5 6mm 6 4 6 4 6 4 6mm 4 4 4 4 6 Relationship between the upper and lower knives 6 Relationship between the upper and lower knives 6 Relationship between the upper and lower knives 6 Relationship between the upper and lower knives Check to make sure positions G on lower knives E are ali...

Page 7: ...9 5 9 5 3 3mm 8 5 8 5 8 5 3 0mm 6 4 6 4 6 4 3 0mm 4 4 4 4 9 Relationship between lower knives needle threads and looper threads 9 Relationship between lower knives needle threads and looper threads 9 Relationship between lower knives needle threads and looper threads 9 Relationship between lower knives needle threads and looper threads After all the adjustments have been completed confirm the foll...

Page 8: ...p surface of thread releaser bar guide B There should be a clearance of 4mm between E ring K and thread releaser bar guide B 5 5 5 5 3 Thread releaser hook 3 Thread releaser hook 3 Thread releaser hook 3 Thread releaser hook The needle threads should not protrude long from the back side of the fabric at the start of sewing Loosen screw C and adjust the position of thread releaser hook D To decreas...

Page 9: ...T The foot lift should be 7mm above the top surface of the needle plate To make this adjustment loosen screw D for crank lever C and then set the clearance between slot A on the presser bar clamp connection plate and screw B at 0 5 1mm When the air cylinder on the pneumatic presser foot lift gets actuated the presser foot lift should be 7mm above the top surface of the needle plate To make this ad...

Page 10: ... should be as little as possible Turning the adjusting screw clockwise decreases the amount Turning the adjusting screw counterclockwise increases the amount The air must blow through behind the needles If the air blows through in front of the needles it may cause the needle threads to be removed from the needles Note The air blowing time is factory set at 1 5 sec s Therefore remove the fabric fro...

Page 11: ... LINES AND CORDS FOR PNEUMATIC DEVICES 10 10 10 10 1 DX004U 1 DX004U 1 DX004U 1 DX004U Connect air lines and cords by referring to the illustration below and the parts list 10 10 10 10 2 DX2 2 DX2 2 DX2 2 DX2 3U 3U 3U 3U ...

Page 12: ...10 10 10 10 10 3 DX2 3 DX2 3 DX2 3 DX2 3U LK 3U LK 3U LK 3U LK ...

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